Abstract
To promote the efficient reuse of waste concrete resources and improve the overall performance of recycled concrete for airport pavements, this study used recycled coarse aggregate produced by crushing waste runway concrete from Terminal T 3B of Chongqing Jiangbei International Airport to investigate the synergistic effects of polyvinyl alcohol (PVA ) fibers and nano-silica (nano-SiO2) on the mechanical properties and durability of recycled concrete. PVA fibers were incorporated at volume fractions of 0.3%, 0.5%, and 0.7%, while nano-SiO2 was added at mass fractions of 1.5% and 2.0%. An orthogonal experimental design was adopted to evaluate the combined effects through tests of compressive strength, flexural strength, abrasion resistance, water penetration resistance, and chloride ion permeability. The microstructure was further examined using scanning electron microscopy (SEM ). The results indicate that the mixture containing 0.5% PVA fibers and 2.0% nano-SiO2 achieved the best overall performance, with an 18.4% increase in flexural strength, a 15.4% reduction in abrasion loss compared with the control group, and a water penetration resistance grade of S12. Microstructural observations show that PVA fibers enhance interfacial bonding between aggregates and the matrix through hydrogen bonding and mechanical interlocking, while nano-SiO2 increases the density of the interfacial transition zone through its filling and pozzolanic effects. Together, they establish a dual strengthening mechanism characterized by microstructural densification and macroscopic restraint. These findings provide technical guidance and a theoretical basis for the performance optimization of recycled concrete for airport pavements and the green recycling and reuse of solid waste.
Publication Date
10-29-2026
DOI
10.14048/j.issn.1671-2579.2026.05.008
First Page
72
Last Page
83
Submission Date
October 2026
Recommended Citation
Gang, Hu; Jiuming, Cai; Julin, Li; Bingxu, Li; Zhi, He; Rui, Li; Yuanyuan, Li; and Tianqing, Ling
(2026)
"Properties of recycled concrete incorporating nano-SiO 2 and PVA fibers for airport pavements,"
Journal of China & Foreign Highway: Vol. 46:
Iss.
5, Article 8.
DOI: 10.14048/j.issn.1671-2579.2026.05.008
Available at:
https://zwgl1980.csust.edu.cn/journal/vol46/iss5/8
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